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checkpatch: add uninitialized pointer with __free attribute check

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Uinitialized pointers with __free attribute can cause undefined behavior
as the memory randomly assigned to the pointer is freed automatically when
the pointer goes out of scope.  add check in checkpatch to detect such
issues.

Link: https://lkml.kernel.org/r/20251203-aheev-checkpatch-uninitialized-free-v7-1-841e3b31d8f3@gmail.com
Signed-off-by: Ally Heev <allyheev@gmail.com>
Suggested-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/all/8a4c0b43-cf63-400d-b33d-d9c447b7e0b9@suswa.mountain/
Link: https://lore.kernel.org/all/58fd478f408a34b578ee8d949c5c4b4da4d4f41d.camel@HansenPartnership.com/
Acked-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Joe Perches <joe@perches.com>
Cc: Andy Whitcroft <apw@canonical.com>
Cc: David Hunter <david.hunter.linux@gmail.com>
Cc: Dwaipayan Ray <dwaipayanray1@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: James Bottomley <james.bottomley@HansenPartnership.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Cc: Menon, Nishanth <nm@ti.com>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: Viresh Kumar <vireshk@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Ally Heev
2025-12-03 20:58:49 +05:30
committed by Andrew Morton
parent e6b4d264c8
commit 01da5216c5
2 changed files with 29 additions and 0 deletions
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6
scripts/checkpatch.pl
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@@ -7732,6 +7732,12 @@ sub process {
ERROR("MISSING_SENTINEL", "missing sentinel in ID array\n" . "$here\n$stat\n");
}
}
# check for uninitialized pointers with __free attribute
while ($line =~ /\*\s*($Ident)\s+__free\s*\(\s*$Ident\s*\)\s*[,;]/g) {
ERROR("UNINITIALIZED_PTR_WITH_FREE",
"pointer '$1' with __free attribute should be initialized\n" . $herecurr);
}
}
# If we have no input at all, then there is nothing to report on